</head>
<style>
 #error_tips{margin-top: 10%;}
	.background{
	background: url({$img})  no-repeat fixed top;
	background-size: 100% 100%;  
	-o-background-size: 100% 100%;
	-moz-background-size: 100% 100%; 
	-webkit-background-size: 100% 100%;
	}
</style>
<body class="background">
<div class="wrap" >
</div>
</body>
</html>